section{
    width: 400px;
    height: 400px;
    margin:  100px auto;
    border: solid 1px gray;
    position: relative;
    div{
        width: 100px;
        height: 100px;
        border: solid 1px gray;
        text-align: center;
    }
    div:first-child{
        position: absolute;
        left: 25%;
        top: 25%;
    }
    div:nth-child(2){
        position: absolute;
        left: 50%;
        top: 25%;
    }
    div:nth-child(3){
        position: absolute;
        left: 25%;
        top: 50%;
    }
    div:nth-child(4){
        position: absolute;
        left: 50%;
        top: 50%;
    }
}
